Summary: Phosphofructokinase was not detected in extracts of 107 prepared in a variety of ways but was highly active in cells treated with toluene. Disruption of these cells destroyed activity of phosphofructokinase indicating that the enzyme is extremely labile. As patterns of labelling from [1-C]glucose and [6-C]glucose showed that 60% of glucose was metabolized via the pentose cycle, augmentation of this cycle is necessary to account for the high molar growth yields of this yeast. Phosphoketolases, reacting with xylulose 5-phosphate and fructose 6-phosphate, were found but the extent to which they contribute to glucose metabolism was not assessed.


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